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2,174 Articles
7,005 Members
119 Directory Listings
142,589 Followers

The world's best gem articles, published weekly.

Most Recent Articles

Gems in Cufflinks

Wearing gems in cufflinks is a great way to add personality and style to an otherwise standard tuxedo. Read about ways to incorporate gems in cufflinks.

What Faceted Stone Sizes Will Sell Best?

How can a custom gem faceter compete with commercial cutting houses? Learn how cut stone sizes, gem quality, and expert cutting can make a difference.

Demantoid Garnet Buying Guide

Stunning green hues and a brilliance that outshines diamond combine to make demantoids truly captivating. Read more in our demantoid garnet buying guide.

Mellite Value, Price, and Jewelry Information

Mellite is a rare and unusual organic gemstone. Although soft and fragile, the “honey stone” is quite beautiful when cut.

Datolite Value, Price, and Jewelry Information

Datolite is a popular collector’s mineral. Polished sliced nodules can show off very attractive colors. Too soft for regular jewelry use, faceted and cabbed datolites are rare.

Citrine Buying Guide

Citrine’s affordable autumn hues make it a great option for trendy jewelry. Read about the quality factors for this stylish gem in our citrine buying guide!

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"Becoming a Pro Member of IGS just made good sense for my business. The gemology resources are fantastic, and my profile lets potential customers know I am serious about colored gemstones. And frankly, if I get any exposure to potential customers it's a no-brainer."
Paul Bierker, Paul Michael Designs
Jeweler, IGS Pro Member

The world's best online resource for gemstone appraisal

Over 15 years, we have assembled detailed pricing and value information for appraising over 70 different gemstones. The values in our guide come from a variety of sources including primary and secondary gemstone dealers, jewelers, miners, and wholesale suppliers of commonly traded gemstones.

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